In a row of letters, a letter is 4th from left end and 13th from the right end. How many letters are there in the row?
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → 16
When one and the same item is counted from both ends, its own position is counted twice, so the total is (position from left) + (position from right) − 1.
Here that gives 4 + 13 − 1 = 16 letters. Checking: with 16 letters, the 4th from the left has 3 letters before it and 12 after it, and 12 + 1 = 13 counting from the right.